Supplemental forging press die



Oct. 4, 1949. c, SCHOGREN 2,483,597

SUPPLEMENTAL FORGING PRESS DIE Filed March 22, 1946 WITNESSES:

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Patented Oct. 4, 1949 V UNITED STATES PATENT OFFICE .1

' 2,483,597 1 1 SUPPLEMENTAL FORGING PRESS DIE Carl E. Schogren,Pittsburgh, Pa., assignor to vHeppenstall Company, Pittsburgh, Pa., acorporation of Pennsylvania Application March 22, 1946, Serial No.656,458 b 1 This invention relates to forging press dies and, inparticular, to the dies used in the forging of shafts or rounds.

vOrdinarily a shaft forging is carried out in two steps. In thepreliminary operation a heated billet or workpiece is forged betweenflat surfaced dies, during which forging the operator turns the billeton its axis and progresses it longitudinally through the press until asubstantially round though angular blank is produced. The finaloperation, which is the rounding ofi of these angles, usually has beenaccomplished by substituting grooved supplementary dies for the flatsurfaced dies used in the preliminary step and re-running the angularshaft through these grooves. Although this process produces a satisfactory product, it is subject to a serious handicap in that, during thetime that it takes to substitute the grooved dies for flat surfaceddies, the shaft has cooled to such an extent that reheating is necessarybefore the final rounding can be carried out.

,An object of this invention is to provide a supplementary die mechanismwhich can quickly and easily be placed in operative position after eachpreliminary forging operation.

Another object is to provide, for use in a shaft or round-forging press,a supplementary die mechanism which can be expeditiously placed inposition to carry out the final roundingoperation.

Another object is to provide, for use with a forging press, asupplementary die mechanism which can be expeditiously placed inoperative position and which includes means for maintaining themechanism in said operative position.

According to this invention, a removable and temporary supplemental diemechanism is provided for use in a forge press having the wellknownstationary lower die and a reciprocable upper one. The die mechanismcomprises supplementary lower and upper dies, the lower being formed torest on the stationary forge press die and the upper formed to beengaged by the reciprocable die. The supplemental dies are attached toeach other by toggle links which are pivotally connected to the frontandrear faces of the dies, and means are provided which act between thesupplemental dies to yieldingly urge them away from each other. The endsof the toggle links are extended belowthe bottom of the lower'and. abovethe top of the upper supplementary dies to form lugs for engagement bythe front and rear faces of the stationary and reciprocable dies. Theplacing of-the supple- 5 4 Claims (01. 78+c0) mentary die mechanism inposition takes so little t me that it is not necessary to reheat theworkpiece, thereby greatly increasing the efficiency of the forgingoperations. Further, any tendency of the mechanism to slide out of itsoperative position during the forging is counteracted by the engagementof the toggle link lugs by the front and rear faces of the stationaryand reciprocable forge press dies.

The preferred embodiment of my invention is illustrated in theaccompanying drawings, of which Fig. 1 is a somewhat diagrammatic frontview of .a forge press with the supplementary die mechanism in operativeposition, and Fig. 2 is a side view of the die mechanism taken on theplane indicated by the line IIII of Fig. 1.

Referring to the drawings, a forging press of the type well known to theart is provided havmg a lower entablature l upon which is mounted astationary die 2, and a reciproca-ble cross head 3 which securely holdsa reciprocable upper die 4. Columns 5 extend through the entablature andare engaged by the cross head which is vertically reciprocated bysuitable fluid pressure mechanism that is not shown.

In the preliminary forging of shafts from blanks, dies 2 and 4 are flatsurfaced and a blank (not shown), which may be held externally of thepress by a crane and engaged by tongs, is turned and fed progressivelythrough the dies from the front to the rear of the press. On completionof this preliminary operation, the blank has assumed a substantiallyround though somewhat polygonal shape and must be finally rounded in afinishing operation which requires the use of grooved dies.

. According to this invention a supplementary die mechanism is providedcomprising a grooved supplementary lower die 6 and a similar upperdie 1. Die 6 is formed to rest on main lower die 2, and die I issimilarly formed to be engaged by reciprocable die 4. Thesesupplementary dies are provided with openings to receive bolts 8 onwhich the ends of pairs of toggle links 9 and II] are pivotally mounted.There are four like pairs of such toggle links, two of which arepivotally attached by bolts 8 to the front and two to the rear verticalfaces of the supplementary dies adjacent to their ends. Extendingthrough registering openings in the free ends of the front and rearpairs of links 9 and H1 at one end of the supplementary dies there is abolt H which, together with a spacing sleeve l2 that surrounds t, p v tco n t he free nd each pair of such links to each other to form atoggle, and also connects the front toggle to the rear toggle. It isnoted that the supplementary upper die is not attached to reciprocabledie 4, and, therefore, means are provided to cause upper die I to risewith the reciprocable die when it is lifted by the cross head. Suchmeans comprise upper and lower arms I3 and I4 which extend between thepairs of toggle links that are attached to the front and the rear facesof the supplementary dies at each end. of such dies. Trunnions areformed on the ends of these arms and the toggle linksare provided withopenings to receive them. Midway between their ends, arms I3 and I4 areprovided with openings to receive a bolt I5 which loosely extendsbetween the upper and lower arms and is maintained in the arms by meansof the-bolt head and. a nut I6. An expansible spring I1 is mounted aboutthe bolt so that its ends bear against the upper and lower arms. In aforging operation, when reciprocal die 4 has completed its down-. wardstroke and is lifted, the spring exerts pressure between arms I3, and I4and forces upper arm I3 to rise. Due to the connection of this arm toits toggle link and the toggle link to upper die TI, the upper die willalso rise to a position in which it will be ready for the next stroke.Nuts I5 limit the spreading movement of the toggles and thus control therise of the upper die. The amount of rise can be varied by changing theposition of nuts I6 on bolt 15, or difierent length bolts may be used.

As a blank is bein progressively fed into the grooves of thesupplementary dies it may, by frictional engagement with one or theother thereof, tend to move the whole mechanism in the same direction,1; e., in a direction from the front to the rear of the press along theaxis of the groove. To counteract this tendency and to a n a n the mchani m n p a v p s t n, lu s t are formed on. the ends of a h ogglelink and are adapted to be engaged by the front and rear faces of thestationary and reciprocal dies. There is no such tendency for the meohaenism to slide in a lateral direction and, therefore lu s t8. old thesupplementary di m hani m n operating posi n.

In d scri in the opera ion of this n ent i w l e assumed that the pr imiary torsion of a shaft has been completed and that it. is des d o perfom he. final r un in operation. The supplemen y d e mec i m is so placedon s a i a y l w r ie. Zthat the front and. rear faces of such die enage lower lugs 18 of the toggles, and reciprocal die I- is lowered toengage lu s 18 on. th up e toggle li ine-time r d. for p riorming this.pos ti ningv opera i n is so short that the, blank does not require rehatin The bla is then ins rt d be n the roov s of s pplemental di s and la d the forgin press is operated to perfo m the desired ni h ng or r nin perat on. Although, not ssary. t is pre abl dur n h fin shing p rat nfor h erator no t p rmit the cross head to rise to such an extent thatthe en ag ment of up lugs with the ecipr cal die is broken. When thefinishing operation is completed cross head 3 is raised to remove thelower end of reciprocable die 4 from engagement by upper lugs 18, aterwhich the supplementary die mechanism may be easily and quicklyremoved.

The invention has been described and illustrated according to what isconsidered to be its 4 best embodiment and use. However, it isunderstood that, within the scope of the appended claims, the inventionmay be practiced by other forms and in other ways than that hereindisclosed.

I claim:

1. A removable temporary die mechanism for use with a forge press havinga stationary lower die and a reciprocable upper die, said mechanismcomprising a lower supplementary die formed to rest on a stationary dieof a forging press, an

upper supplementary die formed to be engaged by a reciprocable die of aforging press, toggle links extending between said supplementary diesand pivotally connected to the front and the rear faces thereof, theends of said toggle links having projections formed to extend below thebottom of the lower and above the top of the upper supplementary dies toform lugs for engagement by the front and rear faces of the stationaryand reciprooalolev dies of such press for maintaining said mechanism in.operat p s t on, and m n acting between said supplementary dies foryieldinsly urgin them a ay f m h other.

2. A removable temporary die mechanism for use with a forge press havinga stationary lower die and a reciprocable upper die, said mechanismcomprising a lower supplementary die formed to rest on a stationary dieof a forging press, an upper supplementary die formed to be engaged by arcciprocable die of a forging press, toggle links extending between saidsupplementary dies and pivotally connected to the front and the rearfaces thereof, the ends of said toggle links havingprojections formed toextend below the bottom of the lower and above thetop of the uppersupplementary dies to form lugs for engagement by the front and rearfaces of the stationary and reciprocable dies of such press formaintaining said mechanism in operative position, arms extending betweenthe toggle links at the front face of the supplementary dies and thoseat the rear face thereof, and springs acting between said arm for y ldinly u g Sold s plem ry di s away. fro ea h t r.

3. A removable temporary die mechanism for use. wit a ioree ess hav asta i a yl w r die and a reciprocable upper die, said mechanism ompris na lower supp em n ary d formed t rest one stat o ary di f a forging pss... an upper supplementary die formed to be engaged by a reciprocabledie of a forging press, toggle links extending between saidsupplementary dies and pivotaii-y c nne ted o e ro t and the. rear racesereo he n f s d toggle n sha c projections medto ex end. belo the t m ofthe. lower and a v he t p of th upp supelemen ary d es t form-lugs foren gement, y, the fron a d rear a es of he stati na y an reciprooable ds. of such pre s for ma ain g aid mechanism operati e posi o armstending. between the'toss e links a the iron int or he sup lemen a y dis and th sev t he rear eeeth re f. bolts extend n loosely through said ad, p ov dedw th heads r l miting the spr ad m vemen of'the t g s. andsprings surroundi g a d bolts and hearing at their ends iiponseid arms fr v l n l u gi g sa d implemen ary dies way fr m each other.

i. A rem vab empo ary d e m chanism for use. within sha t forg ng-P esshaving a-statiom arylower ie and a r iprooable upper die pro. videdwihflat w king surfaces fo prel minary for in operat ons; sa d mechan smcomprising a-lower supplementary die formed torest on. a

'5 stationary die of a shaft forging press, an upper supplementary dieformed to be engaged by a reciprocable die of such press, saidsupplementary dies being provided with working faces having groovesextending from the front to the rear faces thereof, toggle linksextending between and pivotally connected to the front and the rearfaces of the supplementary dies, the ends of said toggle links havingprojections formed to extend below the bottom of the lower and above thetop of the upper supplementary dies to form lugs for engagement by thefront and rear faces of the stationary and reciprocable dies of suchpress for maintaining said mechanism in operative REFERENCES CITED Thefollowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 758,797 Thul May 3, 19041,772,600 Dorman Aug. 12, 1930

